Lambda control by skip fire of unthrottled gas fueled engines

Details Lambda control by skip fire of unthrottled gas fueled engines Lambda control by skip fire of unthrottled gas fueled engines

1995-06-16

1996-09-10

Okonsky, David A.

Internal-combustion engines

Accessories

Covers, trays, vibrators, corrosion inhibitors, air filters

F02B 7700

Patent

active

055535755

ABSTRACT:
The performance of a gas-fueled unthrottled internal combustion engine is improved by optimizing excess air ratio (lambda) in the engine. Lambda is optimized by selecting automatically and continuously the optimum fraction of cylinders firing (OFF) as a function of engine operating parameters, eliminating the fuel charge from one or more cylinders to obtain firing in the OFF, and distributing the unused fuel to the OFF, thereby decreasing lambda in the firing cylinders to an optimum level. OFF may be calculated according to mathematically derived and empirically weighted equations, or obtained with reference to suitable look-up tables. In addition, optimum lambda and OFF may be adjusted to take into account the effects of exhaust gas recirculation (egr), engine speed, and/or engine timing. Further lambda adjustment can be performed by suitable control of egr, ignition timing, and/or turbo air bypass (TAB).

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"Optimized E.F.I. for Natural Gas Fueled Engines" SAE Technical Paper 911650, Aug. 1991 N. John Beck, W. P. Johnson and Peter W. Peterson.
"Cylinder Cutoff of 4-Stroke Cycle Engines at Part-Load and Idle" SAE Technical Paper 820156, Feb. 1982 Eiichi Watanabe and Itaru Fukutani.
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"Improvement of Exhaust Emissions from a Two-Stroke Engine by Direct Injection System" (930497) Huei-Huay Huang, Ming-Horng Jeng, Nien-Tzu Chang, Yue-Yin Peng, James H. Wang and Wei-Li Chiang; Jan. 1993.

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